addRev 195 100 == Success (4,9339,"9339")
addRev (-195) (-10) == Success (4,9339,"9339")
addRev 195 3 == Failure
addRev 888 0 == Success (0,888,"888")
addRev 989 10 == Success (0,989,"989")
addRev 750 (-5) == Success (3,6666,"6666")
addRev 196 1000 == Failure